Thin Film High-Temperature Superconducting Flux Transformers Coupled to SQUIDs
Using photolithographic patterning and laser deposition, we have constructed a sensitive thin-film SQUID magnetometer from YBa2Cu3O7−x (YBCO). The device consists of a flux transformer, deposited on one substrate, which is coupled to a thin-film YBCO SQUID, made with bi-epitaxial junctions, deposited on another substrate. At 77K, the magnetometer has attained a sensitivity of 1.8pTHz−1/2 at 1Hz, and has been used to measure the magnetic signal from the human heart.
KeywordsVortex Attenuation Cage Milling Sapphire
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